Simple fabrication of PVA-ATE (Amaranthus tricolor leaves extract) polymer biocomposites: An efficient UV-Shielding material for organisms in terrestrial and aquatic ecosystems

Chandrappa, H; Bhajantri, R. F.; Ranjitha,; Shwetha,; Prarthana, N

doi:10.1016/j.optmat.2020.110204

Cited by 20 publications

(1 citation statement)

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“…Figure 1(a) curve 'a' clearly shows that in pure PVA there is an absorption band at around 210 nm which is due to n → π * transitions [27] and the red shift in this band is observed as the concentration of Ag NPs in PVA host matrix increases. As a result of this, optical band the gap is altered [28]. Figures 1(b)-(d) presents the absorption spectra after UV exposure for different times (120, 180, and 240 min) and it is evident from this figure that with an increase in UV exposure time there is a continuous increase in the intensity of absorption band.…”

Section: Optical Characterizationmentioning

confidence: 90%

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Nain¹,

Dahiya²,

Chahal³

et al. 2022

Phys. Scr.

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PVA/Ag nanocomposite with different concentrations of silver nanoparticles (Ag NPs) was successfully synthesized by the solution casting method. The effect of concentration of Ag NPs and ultraviolet (UV) irradiation on optical and structural properties of PVA/Ag nanocomposites were investigated by UV-Vis spectrophotometer and Fourier transform infrared spectroscopy. The presence of an absorption peak at around 410 nm recorded by UV-Vis spectrophotometer shows silver nanoparticles are formed. The absorption spectra for prepared nanocomposites recorded over the wavelength range of 200-700 nm shows the intensity of absorption band increases with an increase in the concentration of Ag NPs and with the increase in time of ultraviolet (UV) irradiation. Decreases in the broadness of transmission band with an increment in enfeeblement transmission intensity by UV exposure make its use suitable as a bandpass filter. Decrease in the value of the optical band gap from 4.91 eV for pure PVA to 4.32 eV for PVA doped 0.04M Ag was observed which continuously reduces further with an increase in the concentration of Ag NPs (3.67 eV for PVA doped 0.08M Ag). Additionally, as the time for UV exposure increases the value of the optical band gap decreases from 4.32 eV without UV exposure to 3.81 eV and 3.43 eV for UV exposure of 120 min and 240 minutes respectively for PVA doped 0.04M Ag. This reduction in values of the optical band gap corresponds to the formation of charge formation complexes inside the PVA matrix. Various optical parameters such as refractive index, single oscillator energy, lattice dielectric constant, the strength of interband optical transition, average oscillator strength, etc are calculated for nanocomposite with different concentrations of Ag NPs before and after UV exposure for different times. The refractive index values were observed to increase from 1.69 for pure PVA to 1.85 without UV exposure, which further increases to 2.30 for UV exposure of 240 minutes for PVA doped 0.08M Ag. FTIR spectra show the interaction between PVA and Ag NPs and show changes caused in the structure of nanocomposite as the time of UV exposure increases.

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Section: Optical Characterizationmentioning

confidence: 90%

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Nain¹,

Dahiya²,

Chahal³

et al. 2022

Phys. Scr.

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Development of Zn_1−xBa_xO nanoparticles reinforced poly(vinyl alcohol) macromolecular nanocomposite films: Eco‐friendly integrated materials for optical systems

Chandrappa

Bhajantri

ISMAYIL

et al. 2022

J of Applied Polymer Sci

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In this paper, we report the synthesis of Ba doped ZnO (Zn1−xBaxO, [x = 0.05]) nanoparticles (NPs) with a polycrystalline hexagonal wurtzite structure using chemical co‐precipitation method and prepared optically transparent, high refractive index polymer nanocomposite films by incorporating Zn1−xBaxO into poly(vinyl alcohol) (PVA) matrix. The average crystallite size of 104 nm was estimated by Scherrer's formula from X‐ray diffraction (XRD) patterns. The crystallinity of the composite film is significantly increased when Zn1−xBaxO NPs are added. The basic principles and theoretical aspects of scattering, transparency and refractive index of the composite structures are discussed. The formation of ZnBaO inter metallic bond was confirmed by the IR peaks that appear at the spectral wavenumbers (⁓596–608) cm−1. ATR‐FTIR spectral transmittance strongly proves the intermolecular interactions that occur in the composite film with molecular modification and various functional group impressions. UV–Vis absorption spectrum demonstrates a strong absorption edge around 379 nm owing to oxygen species corresponding to ZnBaO nanostructures in the composite films. The developed polymer composite films yielded strikingly higher RI value of ⁓(n = 2.5) having Abbe's number (υD = 10) with 57% plus transparency for 5 wt% NPs (ZBP‐3) with sufficiently low extinction coefficient values (k⁓10−4). Optical conductivity (σopt) was found to elevate from σopt ⁓ (4.465 × 1010) s−1 for pristine PVA to a σopt ⁓ (1.309 × 1012) s−1 for 5 wt% Zn0.95Ba0.05O filled composite films. Differential scanning calorimetry analysis showed a significant increase in the Tg value. The significant increase in Tm and Td > 311°C values indicates excellent thermal stability. Hence, the nanocomposite films demonstrated an integrated system of excellent refractive index, considerable visual transparency and excellent thermal stability, establishing their potential for use as a wider spectrum of optical system requirements.

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An overview of recent advances in polymer composites with improved UV‐shielding properties

Muzata

Gebrekrstos

Orasugh

et al. 2023

J of Applied Polymer Sci

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Owing to their competitive price, ease of processability, and rust resistance, polymers are the most extensively used materials in everyday life. However, consistent exposure to ultraviolet (UV) radiation can lead to the degradation and discoloration of polymeric materials. Various polymer composites containing inorganic and organic nanoparticles (NPs) have been developed to improve the UV‐shielding properties of neat polymers. However, the most used UV‐shielding inorganic NPs are prone to photocatalytic processes, leading to further polymer chain degradation. To overcome this challenge, organic NPs have been used; however, they easily agglomerate, decreasing the UV‐shielding performance of the polymer composites. Herein, we critically report the fundamentals of the UV‐shielding mechanism and the synthesis methods, surface modification, and characterization of the most important inorganic and organic UV‐shielding NPs. We then summarize the various processing techniques used to disperse NPs in polymer matrices to obtain polymer composites with improved UV‐shielding properties. Finally, we propose a broader understanding of how the NP characteristics, their interaction with polymer matrices, and the various processing methods affect the UV‐shielding performance of the obtained polymer composites. In addition, various applications of inorganic and organic NPs‐containing UV‐shielding polymer composites have been reported.

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Simple fabrication of PVA-ATE (Amaranthus tricolor leaves extract) polymer biocomposites: An efficient UV-Shielding material for organisms in terrestrial and aquatic ecosystems

Cited by 20 publications

References 48 publications

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Development of Zn_1−xBa_xO nanoparticles reinforced poly(vinyl alcohol) macromolecular nanocomposite films: Eco‐friendly integrated materials for optical systems

An overview of recent advances in polymer composites with improved UV‐shielding properties

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Simple fabrication of PVA-ATE (Amaranthus tricolor leaves extract) polymer biocomposites: An efficient UV-Shielding material for organisms in terrestrial and aquatic ecosystems

Cited by 20 publications

References 48 publications

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Ultraviolet (UV) irradiated induced changes in optical properties of PVA/Ag nanocomposite films

Development of Zn1−xBaxO nanoparticles reinforced poly(vinyl alcohol) macromolecular nanocomposite films: Eco‐friendly integrated materials for optical systems

An overview of recent advances in polymer composites with improved UV‐shielding properties

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Product

Resources

About

Development of Zn_1−xBa_xO nanoparticles reinforced poly(vinyl alcohol) macromolecular nanocomposite films: Eco‐friendly integrated materials for optical systems